PlainEnviro

EPA TRI Chemical

1,1,1-Trichloroethane

CAS Number: 71-55-6

Total releases
254.3K lbs
Number of facilities
34
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, 1,1,1-Trichloroethane (CAS 71-55-6) is disclosed by 34 Form R facilities totaling 254.3K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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1,1,1-Trichloroethane (CAS 71-55-6) is a chemical tracked by the EPA Toxics Release Inventory (TRI) program under Section 313 of the Emergency Planning and Community Right-to-Know Act. The TRI requires industrial facilities above specified threshold quantities to disclose annual manufacturing, processing, and otherwise-used volumes, along with quantities released to air, water, land, and off-site transfers.

A carcinogen flag, when present on other chemicals in this database, reflects an assessment from EPA, IARC, or the National Toxicology Program rather than a TRI-specific determination. The largest individual disclosure in the current dataset comes from WESTLAKE US 2 LLC in LA at 170.8K lbs.

TRI volumes are self-reported estimates, not measured stack emissions, and each pound counts equally regardless of chemical toxicity, so total pounds should not be equated with total risk. Inclusion of a chemical or facility in the TRI does not itself establish a health hazard; it documents the public right-to-know record. Consult EPA's IRIS (Integrated Risk Information System) and the Agency for Toxic Substances and Disease Registry for health-effect summaries.

AIR pathway mix

1,1,1-Trichloroethane: how the 254.3K lbs splits

254.3K lbs across all reported pathways

  • Air Releases196.6K lbs77.3%
  • Off-site Transfers28.3K lbs11.1%
  • Land Disposal25.2K lbs9.9%
  • Water Discharges4.2K lbs1.7%

1,1,1-Trichloroethane's 254.3K lbs Form-R total is AIR, with air releases making up 77.3% of the bar. Next segment: off-site transfers at 11.1%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual 1,1,1-Trichloroethane releases across all reporting facilities decreased by 30% (64.2K lbs → 44.7K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for 1,1,1-Trichloroethane is highly concentrated: Louisiana accounts for 69.8% of the reported total (4 facilities). Next: New Mexico.

  • Louisiana 177.5K lbs
  • New Mexico 26.9K lbs
  • Washington 18.2K lbs
  • Kentucky 17.7K lbs
  • Texas 8.4K lbs
Industry Sources

Reporting for 1,1,1-Trichloroethane is highly concentrated by industry: Electric Utilities facilities account for 67.2% of the reported total (1 facility). Next: Hazardous Waste.

  • Electric Utilities 170.8K lbs
  • Hazardous Waste 46.4K lbs
  • Chemicals 32.3K lbs
  • Nonmetallic Mineral Product 4.8K lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of 1,1,1-Trichloroethane. Up to 50 shown.

# Facility Release (lbs)
1 Westlake US 2 LLC
170.8K lbs
2 US Doe Waste Isolation Pilot Plant
26.9K lbs
3 Burlington Environmental LLC
18.2K lbs
4 Arkema Inc
16.2K lbs
5 Formosa Plastics Corp Texas
8.2K lbs
6 Formosa Plastics Corp Louisiana
6.6K lbs
7 Keystone Cement Co
2.4K lbs
8 Buzzi Unicem Usa-Greencastle Plant
2.3K lbs
9 Westlake Vinyls Inc
1.3K lbs
10 Elemental Environmental Solutions LLC
443 lbs
11 Clean Harbors Environmental Services Inc
329 lbs
12 Safety-Kleen Systems Inc.
243 lbs
13 Veolia Es Technical Solutions LLC Port Arthur Facility
206 lbs
14 Heidelberg Materials US Cement LLC
148 lbs
15 Holcim (us) Inc Holly Hill Plant
47 lbs
16 Clean Harbors Deer Park LLC
45 lbs
17 Clean Harbors Aragonite LLC
41 lbs
18 Reworld Tron Corp
37 lbs
19 Lambcon Inc.
30 lbs
20 Westlake Chemicals & Vinyls LLC
20 lbs
21 Clean Harbors el Dorado LLC
10 lbs
22 Lambcon Ready Mix
10 lbs
23 Lambcon Inc.
10 lbs
24 Lambcon
10 lbs
25 Lambcon Ready Mix
10 lbs
26 Heritage Thermal Services
6 lbs
27 Desotec US LLC Darlington Facility
5 lbs
28 Ross Incineration Services Inc
2 lbs
29 Freeport_olin Bc
1 lbs
30 Dow Chemical Co Freeport Facility
1 lbs
31 Buzzi Unicem Usa-Cape Girardeau
1 lbs
32 Blue Cube Operations LLC - Plaquemine Site
0 lbs
33 Norlite LLC
0 lbs
34 Arcwood Environmental - Orange LLC
0 lbs

Frequently Asked Questions

What is 1,1,1-Trichloroethane in the EPA TRI? ▼
1,1,1-Trichloroethane (CAS Number: 71-55-6) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 34 facilities in the United States report releasing this chemical to the EPA.
How much 1,1,1-Trichloroethane is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 254.3K lbs of 1,1,1-Trichloroethane releases to the EPA Toxic Release Inventory across 34 facilities. Release quantities are self-reported estimates covering air, water, land, and off-site transfers. They are disclosure totals, not toxicity-weighted harm scores.
How does EPA TRI classify 1,1,1-Trichloroethane? ▼
1,1,1-Trichloroethane is not marked as a carcinogen in the TRI classification set. TRI classification flags document inventory listing status; they are not a site-specific exposure or health diagnosis. For health-effect summaries see EPA IRIS and ATSDR toxicological profiles.
Which facilities disclose the most 1,1,1-Trichloroethane? ▼
Westlake US 2 LLC in LA reports the largest disclosed release of 1,1,1-Trichloroethane in this dataset, at 170.8K lbs. Most reporting facilities for this chemical fall under electric utilities. Release data is self-reported annually to the EPA under the TRI program. View the full list of 34 facilities on this page.
What is the CAS number for 1,1,1-Trichloroethane? ▼
The CAS (Chemical Abstracts Service) Registry Number for 1,1,1-Trichloroethane is 71-55-6. CAS numbers are unique numerical identifiers assigned to every chemical substance described in the open scientific literature. This identifier is used to search scientific databases and regulatory filings.

Related Guides

Understanding TRI Data
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Which facilities release the most toxics
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Data comes from the EPA Toxic Release Inventory (TRI) program. Release quantities are self-reported by facilities and may represent estimates. The total shown aggregates reports across all facilities and reporting years.

PlainEnviro presents this data without advocacy framing. The presence of a chemical in the TRI database does not by itself indicate a health risk at current exposure levels. For health-related questions about specific chemical exposures, consult your local health agency or a toxicologist.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Toxic Release Inventory (TRI). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.